Went from an Avatar to a cheap TRK Selle SMP...felt good, then went to a Selle SMP Pro and happy days. No discomfort at all.
Trying a used Spez is the most economical option, if you find it's not quite right, I highly rate an SMP. I didn't even have to fiddle with it, right in one go.
Looking into various options currently...
Specialized Romin / Taupe
SMP of some sort
Something with a cutout I'd imagine as I seem to get on well with them